python add zero to string
# add zeros in front of a string
>>> n = '4'
>>> print(n.zfill(3))
004python add zero to string
# add zeros in front of a string
>>> n = '4'
>>> print(n.zfill(3))
004python add zero to string
# add zeros to numbers
>>> n = 4
>>> print(f'{n:03}') # Preferred method, python >= 3.6
004
>>> print('%03d' % n)
004
>>> print(format(n, '03')) # python >= 2.6
004
>>> print('{0:03d}'.format(n)) # python >= 2.6 + python 3
004
>>> print('{foo:03d}'.format(foo=n)) # python >= 2.6 + python 3
004
>>> print('{:03d}'.format(n)) # python >= 2.7 + python3
004python pad with zeros
>>> n = '4'
>>> print(n.zfill(3))
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